(19)

(11)

EP 2 057 641 A1

(12)

(43) Date of publication: 13.05.2009 Bulletin 2009/20 (21) Application number: 07808853.1 (22) Date of filing: 30.08.2007

(51) International Patent Classification (IPC):  H01B 17/26(2006.01) H01B 17/42(2006.01) (86) International application number: PCT/SE2007/050600 (87) International publication number: WO 2008/027008 (06.03.2008 Gazette 2008/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 31.08.2006 SE 0601787 (71) Applicant: ABB Research LTD 8050 Zurich (CH)	(72) Inventors: TÖRNKVIST, Christer S-734 94 Strömsholm (SE) GÄFVERT, Uno S-723 49 Västerås (SE) (74) Representative: Kock, Ina  ABB AB Intellectual Property Ingenjör Bååths Gata 11 721 83 Västerås 721 83 Västerås (SE)